Provides some helpers to deal with testing log subscribers by setting up notifications. Take for instance Active Record subscriber tests:
class SyncLogSubscriberTest < ActiveSupport::TestCase include ActiveSupport::LogSubscriber::TestHelper def setup ActiveRecord::LogSubscriber.attach_to(:active_record) end def test_basic_query_logging Developer.all wait assert_equal 1, @logger.logged(:debug).size assert_match(/Developer Load/, @logger.logged(:debug).last) assert_match(/SELECT \* FROM "developers"/, @logger.logged(:debug).last) end end
All you need to do is to ensure that your log subscriber is added to Rails::Subscriber, as in the second line of the code above. The test helpers are responsible for setting up the queue, subscriptions and turning colors in logs off.
The messages are available in the @logger instance, which is a logger with limited powers (it actually does not send anything to your output), and you can collect them doing @logger.logged(level), where level is the level used in logging, like info, debug, warn and so on.
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Overwrite if you use another logger in your log subscriber:
def logger ActiveRecord::Base.logger = @logger end
Source: show
# File activesupport/lib/active_support/log_subscriber/test_helper.rb, line 96 def set_logger(logger) ActiveSupport::LogSubscriber.logger = logger end
Source: show
# File activesupport/lib/active_support/log_subscriber/test_helper.rb, line 36 def setup @logger = MockLogger.new @notifier = ActiveSupport::Notifications::Fanout.new ActiveSupport::LogSubscriber.colorize_logging = false @old_notifier = ActiveSupport::Notifications.notifier set_logger(@logger) ActiveSupport::Notifications.notifier = @notifier end
Source: show
# File activesupport/lib/active_support/log_subscriber/test_helper.rb, line 47 def teardown set_logger(nil) ActiveSupport::Notifications.notifier = @old_notifier end
Wait notifications to be published.
Source: show
# File activesupport/lib/active_support/log_subscriber/test_helper.rb, line 86 def wait @notifier.wait end